Minoxidil (Trugain) solution should not be used together with dithranol on the same skin area. Dithranol changes the skin's outer protective layer, so more minoxidil may get absorbed into the body than intended.
These medicines can affect each other in a serious way. Do not start taking them together unless your doctor has said it is OK. If you already take both, do not stop either one on your own: speak to your doctor or pharmacist soon.
What to do: Do not use these together on the same skin area unless your doctor has said so.